80170887db
This code is non-conforming and will eventually get cleaned out once we implement proper variable bindings. However, this will aid us in improving other parts of the code right now.
72 lines
2.7 KiB
C++
72 lines
2.7 KiB
C++
/*
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* Copyright (c) 2020-2021, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <LibJS/Runtime/Object.h>
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namespace JS {
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struct Variable {
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Value value;
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DeclarationKind declaration_kind;
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};
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#define JS_ENVIRONMENT(class_, base_class) \
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public: \
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using Base = base_class; \
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virtual char const* class_name() const override { return #class_; }
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class Environment : public Cell {
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public:
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GlobalObject& global_object() { return *m_global_object; }
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GlobalObject const& global_object() const { return *m_global_object; }
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virtual void initialize(GlobalObject&) override;
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virtual Optional<Variable> get_from_environment(FlyString const&) const = 0;
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virtual bool put_into_environment(FlyString const&, Variable) = 0;
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virtual bool delete_from_environment(FlyString const&) = 0;
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virtual bool has_this_binding() const { return false; }
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virtual Value get_this_binding(GlobalObject&) const { return {}; }
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virtual Object* with_base_object() const { return nullptr; }
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virtual bool has_binding([[maybe_unused]] FlyString const& name) const { return false; }
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virtual void create_mutable_binding(GlobalObject&, [[maybe_unused]] FlyString const& name, [[maybe_unused]] bool can_be_deleted) { }
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virtual void create_immutable_binding(GlobalObject&, [[maybe_unused]] FlyString const& name, [[maybe_unused]] bool strict) { }
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virtual void initialize_binding(GlobalObject&, [[maybe_unused]] FlyString const& name, Value) { }
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virtual void set_mutable_binding(GlobalObject&, [[maybe_unused]] FlyString const& name, Value, [[maybe_unused]] bool strict) { }
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virtual Value get_binding_value(GlobalObject&, [[maybe_unused]] FlyString const& name, [[maybe_unused]] bool strict) { return {}; }
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virtual bool delete_binding(GlobalObject&, [[maybe_unused]] FlyString const& name) { return false; }
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// [[OuterEnv]]
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Environment* outer_environment() { return m_outer_environment; }
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Environment const* outer_environment() const { return m_outer_environment; }
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virtual bool is_global_environment() const { return false; }
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virtual bool is_declarative_environment() const { return false; }
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virtual bool is_function_environment() const { return false; }
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template<typename T>
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bool fast_is() const = delete;
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virtual char const* class_name() const override { return "Environment"; }
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protected:
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explicit Environment(Environment* parent);
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virtual void visit_edges(Visitor&) override;
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private:
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virtual bool is_environment() const final { return true; }
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GlobalObject* m_global_object { nullptr };
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Environment* m_outer_environment { nullptr };
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};
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}
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